This is exactly how i felt when i got chorus and delay pedals. Embarrassingly, 5 years after buying the things, i just turned one knob at a time down and up while playing, and it was very easy to tell what i wanted. Basically, all the names of the knobs made sense. Regen was how many times it came back, modulation made it sound like something was wrong with my amp. Delay controls the amount of time between repeats. Mix is how much dry comes through the signal.
I, too, wondered why controls existed, howerver, my controls are very minimal and had someone else set them up, it would have likely been insane. With these subtle settings, i got a ton of compliments on my cleans (volume rolled back).
